Wheaton ABC Vials have a 40% wider opening than standard screw top vials as well as superior thread design that allows for a more secure seal to the closure. The closures for the ABC Vials feature the Wheaton "Super Septa", a low extractable septa that is optimal for GC/MS. ABC Vials have a capacity of 1.8 mL and are manufactured from Type I borosilicate glass. Vials are packaged 100 per shelf pack and 10 packs per case.